Precision CNC machining manufacturers explain how CNC CNC lathes are processed

Precision CNC machining manufacturers explain how CNC CNC lathes are processed

According to the introduction of precision CNC machining manufacturers, the large-scale CNC machining parts are made of bar materials, and the process plan of rough machining and finishing is adopted.… Read more
Speed regulation method of CNC lathe machining spindle

Speed regulation method of CNC lathe machining spindle

In order to meet the requirements of the main transmission of CNC lathe processing, CNC machine tools (attribute: automated machine tools) often use a motor stepless speed regulation system. In… Read more
What are the main components of CNC machine tools

What are the main components of CNC machine tools?

Modern CNC machine tools are all CNC machine tools, which are generally composed of a CNC operating system and a machine tool body. The equipment is specially used to process… Read more
The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces of the slide rail (TTW guide) to form a pressure oil film to float the moving parts , Make the sliding rail (TTW guide) surface in a pure liquid friction state. CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining boring and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In the numerical control processing, the control system issues instructions to make the tool perform various movements that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and letters, and the processing required by the processing technology. It generally refers to the process of processing parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. According to different load requirements, the static pressure guide rails of CNC machining lathes are divided into two types: open type and closed type. The open hydrostatic guide rail can only bear the load in the vertical direction, and the ability to withstand the subversion moment is poor; the closed hydrostatic guide rail has the ability to withstand all aspects of the load and the subversion moment. The sliding rail (TTW guide) of the hydrostatic slide rail (TTW guide) is in a pure liquid friction state, so there is no wear (a basic type of component failure), precision (precision) retention, and life ( Long lifetime), and the friction coefficient of the slide rail (TTW guide) is small (typically 0.0005 to 0.001), and the mechanical efficiency (efficiency) is high, which can maintain the guiding accuracy (precision) of the slide rail (TTW guide) for a long time. CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining boring and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. The pressure oil film has large bearing capacity, good rigidity, and good vibration absorption. The sliding rail (TTW guide) runs smoothly and is not easy to crawl at low speeds. However, the structure of the static pressure guide rail is relatively complicated, and an oil supply system with a good filtering effect is required, and the manufacturing cost is also high. This guide rail is mostly used in heavy-duty CNC machining machine tools.

Hydrostatic guideway of CNC machining lathe

The static pressure slide rail (TTW guide) of the CNC machining lathe transfers the oil with a certain pressure through the throttle to the oil cavity between the sliding surfaces… Read more
The feed drive of CNC machining machine tools has higher requirements for position accuracy (precision), fast response performance, and speed adjustment range. In the numerical control processing, the control system issues instructions to make the tool perform various movements that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and letters, and the processing required by the processing technology. It generally refers to the process of processing parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. CNC machining CNC is also called computer gong, CNCCH or numerical control machine tool. It is actually a kind of name in Hong Kong, which greatly reduces the number of tooling. CNC machining parts with complex shapes does not require complicated tooling. CNC machining is a new type of processing technology, the main work It is to compile the processing program, that is, to convert the original manual work to computer programming. If you want to change the shape and size of the part, you only need to modify the part processing program, which is suitable for new product development and modification. There are three main types of motors for CNC machining machine tools to achieve feed transmission: stepper motors, DC servo motors and AC servo motors. At present, stepping motors are only used in economical CNC machine tools (attributes: automated machine tools), DC servo motors are being extensively used in our country, and AC servo motors as ideal transmission components are gradually replacing (step by step). One substance replaces another substance (mostly the strong replaces the position of the weak)) DC servo motor. When the feed system of the CNC machine tool adopts different transmission elements, the transmission structure is different. There are three main forms of connection between the motor and the lead screw, as shown in Figure 69. 1. Gear transmission mode For the connection form of the motor and the lead screw, the CNC machining machine tool generally adopts a gear transmission pair in the feed transmission device to achieve a certain speed reduction ratio requirement. Since gears may not meet the requirements of the ideal tooth surface during manufacturing, there is always a certain error. A pair of meshing gears must have a certain tooth side clearance to work normally, but the tooth side clearance will cause reverse transmission clearance. For a closed-loop system, the side clearance will affect the stability of the system (explanation: stable and stable; no change) (The stability of). Therefore, the gear transmission pair often adopts an anti-backlash mechanism (organization) to minimize the tooth backlash. 2. Synchronous pulley transmission form The structure of this connection form is relatively simple. In the numerical control processing, the control system issues instructions to make the tool perform various movements that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and letters, and the processing required by the processing technology. It generally refers to the process of processing parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. Synchronous belt transmission combines the advantages of belt transmission and chain transmission, which can avoid vibration and noise caused by gear transmission, but it can only be applied to occasions with low torque characteristics. The requirements for center distance during installation are strict. The manufacturing process of belt and pulley complex. 3. Coupling transmission form Usually the motor shaft and the screw are connected by a cone-ring keyless connection or a high-precision (precision) cross coupling (Coupling), so that the feed transmission system has a higher transmission accuracy (precision) and transmission rigidity. And greatly simplify the transmission structure. This type of connection is commonly used in the feed drive of machining centers and numerically controlled machine tools (attributes: automated machine tools) with high precision (precision).

The connection between the motor and the screw of the CNC machining machine tool

The feed drive of CNC machining machine tools has higher requirements for position accuracy (precision), fast response performance, and speed adjustment range. In the numerical control processing, the control system… Read more
The feed motion of a CNC machining machine tool is the direct object of digital control. Regardless of point control or contour control, the final dimensional accuracy (accuracy) and contour accuracy of the workpiece are affected by the transmission accuracy and sensitivity of the feed motion. (Sensitivity) and stability (explanation: stability and stability; no change). For this reason, the feed system of CNC machining machine tools should pay full attention to reducing frictional resistance, improving transmission accuracy and rigidity, eliminating transmission gaps, and reducing inertia of moving parts. 1. Reduce friction resistance In order to improve the rapid response performance and motion accuracy (precision) of the CNC machine tool (attribute: automated machine tool) feed system, the friction resistance and the difference between dynamic and static friction of the moving parts must be reduced. In order to meet the above requirements, in the feed system of CNC machine tools, ball screw nut pairs, hydrostatic screw nut pairs, rolling slides (TTW guide), hydrostatic guide rails and plastics (structure: synthetic resin, plasticizer) are commonly used , Stabilizers, pigments) guide rails. While reducing the frictional resistance, it is also necessary to consider that the transmission components should have appropriate damping to ensure the stability of the system (explanation: stable and stable; no change) (The stability of). 2. Improve transmission accuracy (precision) and rigidity The transmission accuracy (precision) and rigidity of the feed transmission system are mainly determined by the transmission clearance and the accuracy and rigidity of the screw nut pair, worm gear pair (circumferential feed) and the supporting structure from the mechanical structure consideration (consider) . CNC machining CNC is also called computer gong, CNCCH or numerical control machine tool. It is actually a kind of name in Hong Kong, which greatly reduces the number of tooling. CNC machining parts with complex shapes does not require complicated tooling. CNC machining is a new type of processing technology, the main work It is to compile the processing program, that is, to convert the original manual work to computer programming. If you want to change the shape and size of the part, you only need to modify the part processing program, which is suitable for new product development and modification. In the numerical control processing, the control system issues instructions to make the tool perform various movements that meet the requirements, and the shape and size of the workpiece are expressed in the form of numbers and letters, and the processing required by the processing technology. It generally refers to the process of processing parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. The transmission gap mainly comes from the transmission gear pair, worm gear pair, screw nut pair and its supporting parts. Pre-tightening force should be applied or measures to eliminate the gap should be taken (refer to the solution to the problem). Shortening the transmission chain and setting a reduction gear in the transmission chain can also improve the transmission accuracy. Enlarging the diameter of the screw, and applying pre-tightening force to the screw nut pair, supporting parts, and the screw itself are effective measures to improve the transmission rigidity. Insufficient stiffness can also cause crawling and vibration of the workbench (or carriage). 3. Reduce the inertia of moving parts The inertia of the moving parts has an impact on the startup and braking characteristics of the servo mechanism (organization), and the inertia of the parts running at high speeds has a greater impact. CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, CNC machining boring and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. Therefore, on the premise of satisfying the strength and rigidity of the components, the mass of the moving components and the diameter and mass of the rotating components may be reduced as much as possible, so as to reduce the inertia of the moving components.

The requirements of CNC machining machine tools for feed motion

The feed motion of a CNC machining machine tool is the direct object of digital control. Regardless of point control or contour control, the final dimensional accuracy (accuracy) and contour… Read more